Hot-blast stove.



K. L. LANDGREBE.

HOT BLAST STOVE,

I APPLICATION FILED IULY3I. I9I5. Llm. .Im-@med Jan. 1I, 1916.

. 2 SHEETSnSHEET l. i 9

K. L. LANDGREBE.

HOTBLAST STOVE.

APPLICATION FILED IULYSI. I9I5.

Patented Jan. H, i916.

Lll.

www? I@ 'furnaces and the like.

KARL L. LANDGREBE, or ENSLEY, ALABAMA Hor-BLAST s'rovniL Specicatlon of Letters Patent.

Patented J an. 11, i916.

Application filed July 31, 1915. Serial No. 42,928.

To all whom it may :concern Be it known that I, KARL L. LANDGRnBn, a citizen of the United States, and residentl of Ensley, in the county of Jelferson and State of Alabama, have invented certainnew and useful Improvements in Hot-Blast Stoves, .of which the following is a specification.

The present type of stove consists of a single shell having withinit the combustion and heating chambers, the heating chamber being filled with checker work and the combustion chamber being unobstructed.V

The object of hot blast stoves is to heat air forced through the same for use in blast The checkers are heated by means of gas from the'blast fur-v nace and air combining in the combustion chamber andbeing drawn or forced through the checkers, thereby heating them. When suiiiciently heated, air is forced through said heated checkers, absorbs heat therefrom, and is directed through the combustion chamber into the blastfurnace.

In the present type of stove great di-Av eulty is experienced in the burning through of the walls ofthe combustion chamber,

- for the checkers to thereby harming the checkers in the heating chamber, necessitating shutting down the stove for repairs. As it takes a long time cool suliciently to permit men to enter the stove to make re airs, a great amount of time is lost, as the ieating in the 'combustion chamber cools much more slowly than the 'combustion chamber.

One of the objects of my invention' is to provide an arrangement wherein the com bustion and heating chambers are contained in separate shells, suitably conne'cted for operation, and thereby effecting a 'great savingI of timev in making-repairs as well as providing a heating chamber composed wholly of checkers, whereby a greaterr amount of air blast is heated. 'I am also able to employ a cylindrical. combustion chamber,l which shape has been found to be the best for burning the gas most efciently. l further provide a shell surroundingthe walls of the combustion chamber through which shell or annular space the cold air blast is directed. "Two results are thereby accomplished (l) preheating the cold air so that it more readily combines with the gas-es chamber, thus utilizing the heat radiated by the walls of said chainber, and (2) cooling the walls of the combustion chamber by the air blast, thereby prolonging the life of the walls.

y using the stoves embodying my invention it is ,possible to supply enough highly preheated air for the successful operation of a blast stoves than is possible with the stoves of the type now in general use-a great economic advantage.

To further increase the eliiciency ofthe heating chamber, -I employ a novel arrangement of pipes "at the bottom of the heating chamber.

Another of the disadvantages of the pres' ent type of stove is that through the checkers do not moveuniformly therethrough. To overcome this channeling of the gases andthus uniformly draw the gases through the checkers, I prefer to employ a plurality of pipes in the bottom of the .heating chamber, distances.

To'accomplish these and other objects, my invention Lconsists incertain features and combinations hereinafter described "and pointed out in the claims. l.:

In the accompanying drawings: Figure l.

is a vertical `sectional view 'of a stove eme bodying my invention, and Fig. 2 is a sctional view on line 2-2 of Fig. l through furnace with a fewer number of .l

spaced apart at equal `the heating and combustion chambers; the

checkers are shown as out away to permit a view of the novel arrangement of exhaust pipes at the bottom of the heating chamber.

In the drawings, the combustion chamber is indicated by the numerall and the heating chamber by the numeral 6, these chambers being connecteduby a Hue 7. h/anhvolc covers 8 and 9 provide for entrance to the chambers 5V and 6. These covers are suitably lined with brick to prevent burning. A gas main 10 leads from thebl-ast furnace and is connected by a pipe 11, to the interior of the combustion chamber 5. A suitable valve 12 is .located in the pipe 11. A hot blast main 13 is connected to the chamber 5 by a. pipe-.14 and a valve 15.

3.6 represents the brick walls of the chamber 5, surrounded by a shell 17.

The checkers in the heating chamber 6 are designated by the numeral 18. They are j 7 0 the gases forced Y Larches 19..., is the bottom 'ot the heating admission to the stack line 2d.

Between v the Shelli? and the wall v1b ot .the combustion chamber' 5, l provide an annular space leise provide another an.-

fnular space'26 lat the bottoni of the chainusual bricks through the Walls.

y space 26 is connected to fin'f'gf22 by a pipe upstanding pipe 1 Cold air from the main 29 4the pipe 32 vto the bustle pipe 33, 'from which ber 5 andconnect spaces 25 and 26 by a pipe 27 having a valve 23 therein. The annular the interior of the chamber 5by openings 35.

An air main 29,1connecte'd to the breecli- 3.0,"and a valve-31 has an 32 and. a valve 32a leading to'a."loustlel pipe 33 around the combustion chamber, which pipe is connected to the annularspace 25 by pipes 34.

The heating chamber 6 is composed of the usual Walls and 'a shell 36. The neck or flue 7 isacomposed of brick Walls 37 and a shell 38. v-

The ,operation oit the stove is as follows "llo heat the checkers 18 in the heating cl'lamber 6, gas is admitted to the combustion chamn ber 5 romthe gas main 10. through pipe 1l,

is iorced through it enters the annular space 25, Where it be comes heated by the radiation from the Walls 16. 4 Thevvalls 16v may be made of special bricks provided with holes, or else of the forming .checker openings i The heated air passes through the pipe 27 and the valve 28 into the annular space 26, thence through openings 35 into the combustion chamber v5. Peep-holes are provided to enable one to observe the .process of combustion inthe chamber 5., The combined gases and air, being hot, are led through tlic'neclr' f7' down through the checkers 18 through the pipes 21 to the breeching 22', thence/to the stack,

the Vvalveslo' and 31 being closed!" When the heating chamber has absorbedl sufficient heat, the valves l2 in thej'gas lineand 32 in the air line are closed; also valves 23 and 23. lAir valve 31 and hot blast valve are opened. lThe vcold air blast rushes through the pipe 30, breecliing 22, pipes 21 and checkerwork 18, Where it is heated, through the neel: 7, chamber 5, pipe 1d, and into the main 13, whence it is delivered to the blast fur nace, The valve 28 in line 27 is closed so that the economy effected by preheating the air for combustion may not be lost by allow- 22, which latter is cona recepiti. l

ing the hot blast to enter the annular space 25 and there give up its heat by radiation.

@ne oit the advantages derived from designing the neck 7 in the manner shown is to allow the brick Walls 1G and 35 of the chambers 5 and 6 to expand upwardly without exerting any undue strains on the snella 17 and 36 surrounding the walls.

l do not limit myinvention to the exact form disclosed, but consider any modification embracing separate combustion and heatingl chambers connected in any manner as coming Within the scope of my claims and the spirit of my invention. I

l claim:

l.. ln a hot blast stove, the combination of a heating chamber, and al separate combustion chamber, means connecting said chain* bers, a breeching, a plurality of pipes leading from the bottom of the heating chambx` and directly connecting heating chain ber andA said breeching, a staclnand means connecting said breeching and said stack,

substantially as described.

yln a hot blast stove, the combination of a heating chamber and a separate combustion chamber, means connecting said chambers, breeching, a plurality of pipes lead trom the bottom ot heating chamber connecting said heating chamber and said breeching, stack, and means connecting said breeching and said stack, said combustion chamber provided with a shell about its Walls, an air blast line connected to said shell and to breeching, and valves in said connections, substantially as described.

3. heating chamber provided With a plurality of substantially vertical passages therethrough, a plurality ot' pipes arranged to extend through the bottom of said chamber, a stack, said pipes connected to said staclr,'an air main, connections between said air main and said stack connection, a valve in said connection, a combustion chamber yapart from said heating chamber, connections betiveen said chambers, a shell about said combustion chamber, connections between said air main and said shell, connections between said shell and said combustion chamber, and a valve in said connections, substantially as described.

Signed vat llnsley, Alabama, this 17th day of duly, lll, v

KARL L. LliYDGREBE.

lWitnesses:

detras?. Dorm, li. liunrone. 

